fix: remove invalid priority field from AndroidNotification in FCM v1 payload

src/Services/FCMService.php

@@ -128,10 +128,6 @@ class FCMService
                             'error', 'warning' => 'notifications_alerts',
                             default => 'notifications_general',
                         },
-                        'priority' => match ($type) {
-                            'error' => 'HIGH',
-                            default => 'NORMAL',
-                        },
                         'sound' => 'default',
                     ],
                 ],